每一种化合物都必须有确定的组成，这可以用其元素的符号来表示。

Sustainability isn't an option anymore—it's a necessity for any business that wants to thrive in the future.

软件开发中最重要的一个方面是明确你要构建什么。

Every building is a prototype. No two are the same.

未来的水产养殖将依赖于智能化和环保技术的结合。